Apparatus for producing coal-dust and carrying it into furnaces.



No. 679,046. 'Patented July 23, I90I. F. DE CAMP. APPARATUS FDR PRODUCING COALv DUST AND CARRYING IT INTO FURNAGES.

(Application led Oct. 8, 1900.)

(No Model.)

UNITED STATES PATENT EETCE.

FERDINAND' DE CAMP, OF BERLIN, GERMANY.

APPARATUS FOR PRODUCING COAL-DUSTi AND CARRYING IT INTO FURNACES.

SPECIFICATION forming part of Letters Patent No. 679,046, dated J' uly 23, 1901.

Application Ifiled October 8, 1900. Serial No. 32,330. (No model.)

To LZZ whom, t may concern,.-

Be it known that l, FERDINAND DE CAMP, engineer, a subject of the German Emperor, residing at 170 Mllerstrasse, Berlin, Germany, have invented a certain new and useful Improvement in Apparatus for Producing Coal-Dust and Carrying It into Furnaces, (Oase No. 1,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to an improved apparatus for producing coal-dust and carrying it into a furnace. In my said apparatus the small coal entering the casing of the apparatus and not yet being mixed with air is ground at first between rotating at surfaces provided with ribs and then mixed with air by means of ventilator-vanes arranged on the back side of one of the said dat surfaces and throwing the coal-dust mixed with air into the furnace. Thus the mixing of the coaldust With air is effected only after the fuel being completely ground in such a manner that the air-current cannot influence the coaldust during the operation of grinding, and thus the material is kept pending during a long time between the grinding-surfaces.

According to my present invention there are provided means for regulating the entrance of the air with regard to the quantity of the introduced coal. As such a means I provide a slide-valve, by which the air-inlets may be closed more or less, or I arrange between the air-inlets and the ventilator-vanes a rotating disk provided with openings and adapted to be moved to and from the air-inlets, or I may use both the slide and the rotating disk in combination with each other.

Now I shall describe a preferable modification of an apparatus constructed according to my said invention and shown on the accompanying drawings, in whichn Figure l is a vertical section rectangular to the axis, and Fig. 2 is a vertical section taken in the direction of the axis.

The front wall of the casing a is provided wit-h ribs a' on the inner side. Within the casing a rotating disk b, preferably made of cast-steel, is fixed on a shaft b', driven by a pulley b2. The said disk b is provided with removable ribs c opposite to the ribs a of the casing d and carries on its periphery tappets g. The coal is fed through the hopper d, Fig.v 2, to the feeding-screw m, driven by the conical pulley f with adjustable velocity. This feeding-screw leads the coal info the casing a, where it is ground between the ribs Ct'and c. If thus the coal is ground to coal-dust, it is gripped by the tappets g, distributing it in the casing. At the same time air is sucked in through the openings 7o by means of the ventilator-blades 0, fastened on the back side of the disk?) and throwing the coal-dust mixed With air through the screen 7L and the channel n into a furnace. (Not shown in the drawings.)

The ventilator-blades 0 are covered by a disk t', provided with openings t" opposite to the air-inlets 7o of the casing a. The latter may be closed more or less by a slide Z, whereby the entrance of the air is regulated according to the quantity of the coal. For effecting such a regulation still more exactly the shaft b', with the rotating parts b o t' fastened thereon,can be moved axially by means of the screws p, such moving the disk vl to or from the openings lo. If the disk t' is moved to close against the rear Wall of the casing, then the air can only pass through the openings i if during the rotation of the disk t the openings t" coincide with the openings 7c. If, however, the disk i is moved somewhat to the right hand of Fig. 2, the air-current becomes more constant, it being, however,throt tled by the small distance between the wall of the casing and the disk t'. If this distance is enlarged, the air-current will flow through it freely.

Having now particularly described and ascertained my said invention and the manner in which the same is to be performed, I declare that what I claim is- 1. In an apparatus for producing coal-dust and carrying it into a furnace the combination of a casing provided in its interior on its front wall with ribs, of a disk also provided with ribs opposite to the ribs of the casing and rotating in the latter of ventilator-blades arranged on the back side of the said disk and of an inlet and an outlet for the fuel..

2. In an apparatus for producing coal-dust and carrying it into a furnace the combina- IOO and of air-inlet openings arranged in the rear Wall of the casing.

In Witness whereof I hereunto subscribe my name this 20th day of September, A. D. 1900.

FERDINAND DE CAMP.

VVtnesses:

HENRY HASPER, WOLDEMAR HAUPT. 

